Check the listing for details. B&W TEK Optical Spectrometer Less Optics - RAMAN SPECTROMETER PARTS- DIY. Condition: Used. Listed at 119.99 USD. Up for sale is one B&W TEK spectrometer less its bench/optics. You get everything you see in the first picture which includes a Sony ILX-511 detector, A/C adapter, and USB to RS232 cable. You also get a link to free software that works with this spectrometer. These spectrometers were originally installed in medical devices and were used for RAMAN spectroscopy but in my opinion they are more suitable for general, non-RAMAN spectroscopy. Just add your own optics and you are good to go. To find detailed information about these units, please Google "Spectrometers - Science-Surplus". When you get there, please don't forget to click on "spectrometer resources" which has the most useful information and also where you can also download the free software to run these spectrometers. I have been an eBay member since 2001 with excellent positive feedback. If you have any questions please scroll up and click "contact seller". Thank you.